Ive got to disagree on this one. Ive got an old hp slate 2 tablet laying around that came loaded with win 7 pro...which honestly i have hardly bothered using as it was simply a dog of a thing to use. So slow to the point where it was good for almost nothing but a doorstop or paperweight. Ive since installed win 10 preview 10049 and what a difference in performance. Its actually improved greatly to the point where im finding i actually want to keep it on the coffee table and use it. Surprised me as past experience installing a newer os on old hardware has been that it runs alot slower. Functionality is streets ahead now too...though i guess it makes a difference when the os is designed to run on a tab. Haven't installed it on anything else yet though so time will tell. Could just be drivers are much better implemented for the hardware? Who knows